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4.3 Network Layout View | 83
The De-Sliver mechanism is intended to allow obviously unintuitive unrealistically
long queues to be corrected but the decision whether the queue profile is unrealistic
rests (as it should do) with the engineer and care should be taken not to use the DeSliver Mechanism to unjustifiably ‘fiddle’ queue lengths.
If a Lane has had a De-Sliver Threshold value set it will be shown in the Network
Layout View with a blue indicator at the front of the Lane.
Entry Profiles. The ‘Inherit Cyclic Profile from Upstream Exit Lane’ setting is used
when joining two Network regions. The boundary between two Matrix Based Network
regions is shown below. Similar principles apply when joining a Matrix Based region
to a Lane Based region.
At
the boundary of two Network regions where either region is Matrix Based Zones
model traffic starting or terminating at the region boundary when in reality the traffic is
crossing the region boundary. Zones at each side of the boundary exist only to
support the splitting of the model into regions. This allows routes within each region
to be modelled while avoiding having to model routes between regions. Normally
traffic entering a Lane from a Zone has a flat profile over a signal cycle. Where the
Zone is used to split the Network into regions the model will be more accurate if
traffic leaving a Zone to enter a region uses the cyclic flow profile shape of traffic
Ver. 3.2.10 | January 2013